thanks for the vote of confidence there knight74. its just that i can't throw out david kierki's opinion cause i agree with johnwhof here, the man obviously knows what he's talking about and look at his experience which is 30 plus years of not only operating he also engineers them. i'm not saying the members on here don't have that experience cause its obvious they do and i respect that. its obvious rc pilot isn't a fan of lean hot breakins and david kierki is. i don't know any of the two so i don't know who to believe. i've heard of guys trying that method and their engines perform better in the long run. and i heard of guys breakin them in rich with no problems. one way has to better than the other. i'm not knocking anybodies opinion..........its just nice to hear facts.